Lunch box



FIG. 1 is a front side elevational view of a lunch box according to a first embodiment of the invention;

FIG. 2 is a back side elevational view thereof;

FIG. 3 is a right side elevational view thereof

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a lunch box, as shown and described. 